MQ-135 Gas Sensor Module

This sensor detects a number of gases so that air quality in general can be measured. The sensor has both an analog and a digital output. The digital output gives a high signal when the gas concentration exceeds a certain threshold value. This threshold value can be set with the potentiometer.

Specifications:

• Supply voltage: 5V DC
• Signal voltage (digital pin): 5V
• Output voltage (analog pin): 0 - 5V
• Detectable gases: Carbon dioxide, ammonia, nitrogen oxides, benzene, alcohol and smoke
• Minimum preheat time: 24 hours
• Dimensions (without headers): 32.5 x 20.5 x 22mm

Pinout:

• VCC: Supply voltage
• GND: Earth/min/ground
• A0: Analog output from the sensor
• D0: Digital output of the sensor

Package contents:

• 1x MQ-135 Gas Sensor Module